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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>css3基础入门</title>
    <style >
        h2,p {
            font-size: 30px;
            color: blue;
        }
        div {color: red;}
    </style>
</head>
<body>
    <h1 style="font-size: 30px;  color: green; ">css3基础入门</h1>
    <h2>感觉还不错</h2>
    <p>前端工程师很简单</p>
    <div>把里面的文字设置为红色</div>
</body>
